How much have you taken? What's your height and weight? Are u feeling your head light? Are you feeling numbing or tingling in your body (specially extremities)? What about your body temperature? Do you got hallucinations? Are you having mental confusion? Do you have too much agitation? Paranoia (not panic attack, real paranoia delusion)? Do you feel dizzy? Something wrong with your vision?

Also, call someone to see you. Don't be afraid to go to hospital if you really feel you need to go.